Vacuum operated heat control



C. H. KIRBY April l2, 1932.

VACUUM OPERATED HEAT CONTROL 2 Sheets-Sheet l Filed Dec. l2 1927 VE :1 '/arles H April 12, 1932. Q Hl KlRBY VACUUM OPERATED HEAT CONTROL Filed Deo. l2 1927 2 Sheets-Sheet Patented Apr. 12, 1932 ,Y sare CHARLES H. KIRBY, OF

Aralarv ori-ice FLINT, MICHIGAN, ASSGNOR TO MARVEL CARBUR-TER COM- PANY, A' CORPORATION 0F' ILLINOIS i x VACUUM 'ornnarnn HEAT 'CONTROL l n Application led. December 12, 1927. Seria1`No. 239,373.

This invention relates to a vacuum operated heat control for the exhaust jacketed intake manifold of an internal combustion engine. j, l

5 It is an object of this invention to provide a heat control for bypassing varying amounts of exhaust gases through the jacketed intake manifold in accordance .with varying conditions of operation of the engine. IV have im found that the suction in the intake manifold ating a maximum suction pressure drop inl thefmanifold above the throttle. When the engine suction pressure drop islow andV is laboring at slow speed, heating is undesirable, while drop is sutlicient to operate the heat control to produce the desired heating effect, ya resultv not obtainable with a direct operating 'conn x nection between the throttle-andA the heat con'- "j trol, is undesirable because of the varying heat requirements at full throttle.

It is also an object of this invention to provide amanual adjustment for varying the effect of the vacuum operated heat control.

It is another object of this invention to provide a simple easily manufactured and serviced device of the class described that will be reliable and automatic in operation.

Other and further important objects of this invention will be apparent from the disclosures in the specification and the accompanying drawings.

` This invention (in a preferred form) is i1- lustrated in the drawings and hereinafter l' more fully described.

On the drawings:

Figure 1 isa fragmentary elevation of the exhaust and intake manifolds of an engine to which a device embodyingV the features of this inventionl has been applied.

at high speeds the pressureV open, thus sionof the exhaust gases'through the j acket.` n.

.side-of the jacket 12 90 on alpiston rod 28 Figure 2 is aj'vertical section on the line II-II of Figure 1. 'i

Figure 3 is a fragmentary section on theV` line III-III of Figure 2. Y

' Figure L,Lis a vertical section ontlieoline IV-V of Figure 2. Y i

4Figure 5`is a section similar to Figure 2 v showing the application of a manual control for regulating the automatic operation of the device of this invention.

y As shown on the drawings :V Y

' Anr exhaust manifold 10 is provided, With a flanged side opening 11 towhich is bolted a bypass jacket 12 integral with and surroundthe uptake 13 from a carbureter connec- 14 having a throttle valve 15 ;V the intake manifold also Vhaving side branches 16 extending through the walls of the jacket. The jacket 12 is provided With a central par-V tition 17 extending nearly tothe bottom thereof, ports 18`and 19 opening into the exhaust manifold on either side of the partition so that the by-pass path'of the exhaust gases comprises entryat one of the ports '18 or 19, thence downwardly on one upwardly along the other side, exhausting back into theexhaust manifold through the other of the ports-18l or 19. A segmentally apertured disc 2() is carried by a shaft 21, this disc being adapted to simultaneously vcover and uncover the-two 'portslS and 19. Y An outstanding plate 22v is valsocarriedby the disc, they plate serving to substantially block the exhaust manifoldbetweenthe by- S pass ports whenf'the yby-passfports are fully f causing a nearly complete diver- A cylindrical casing 23 is bolted tothe and has a passage 24.- connecting to the interior of the uptake 13 in vtapered recesses in invention disclosed in Figures 1 and 2, a piS:

'ton 26with acup leather seal 27 is mountedV which is journaledin a g cover 29,`the rod and piston being urgedfupwardly'rby a spring 30 acting against Va pin '31 inthe rod.'V VA'link 32 connects the upper side of the partitionvaround* the lower edge thereof and through a double'tapered plug 25 which' seats Vthe casingand jacket. Y 'In the simple or non-regulatedfo'rm of the zii erative position, the various parts` being.;

shown in their extreme positions in Figure 2.

The downward movement-1ot'thepistonand# rod meets an increasingresistance in the spring 30 proportionalto' theextent olwthe'4 movement, so. that themovement of the piston and valve is proportional tothe suction pressure. drop in the intake manifold.

The modificationzshownin Fignre 5 relates i; to ba manual ,control superimposed on .the-.au-

tomatic form of controlafor regulating the eectthereof. The structure previouslydescribed is unchanged in .functiom the manual control .being added thereto... In.. principle, this manual lcontrol .comprises providing a. restricted air passage. 35 through thefrod- 28 fromabove the piston. to. below the piston, and Yin.. applying manual 1 control4 to .the vent hole. 34. previously. described., Ini operation, ifthis. .vent isentirelyshutfol, it will be evi.- dent. that. intake. manifold suction would quickly be communicated to .above the :piston 26..'softhlat1the pressures: would be. equalized and the. piston. would not. move .regardless of how muchthe suction pressure. drop should increase.V It the vent hole be greatly enlarged relative to' the size of: the. restricted passage 35, thefvacuunreffect onthe piston willbe. substantially the :same as if the passage 35l were omitted., inithe. simple or primary, form first. described, .and the device would. operate as previously` describedl. It this. vent. is then: regulated in area. between these. two.. eXtremes,;.the range. of4 operation ofY the automatic. control willbe shiftedV to smaller pressure-differentials. in the intake manifoldzas the ventis. opened up. and the manual.. control will thus. render the automatic control more sensitive` andrespons-iveto pressure dierences.

In order to accomplish.this.result,..a boss 36 is: formed `on the cover 29. around the vent 34,. at needle valve .37. being. pressedf downwardly 4into .the vent. A bellcrankrlever 38 serves to. lift. the needle valve. upwardly against the actionof. a spring 39,.this.bell crankfbeingpreferably connectedlto a nullrod an improved automatic by-pass heat controlling mechanism that can be conveniently modified in range by means of a manual control.

I am aware that many changes may be made, and numerous details of construction may be varied through a. wide range: without departing from the principles of thisV invention, and I therefore do not purpose limiting thai patent.' granted h'ereon, otherwise than necessitated. bythe prior art.

I claim as my invention:

11.? I-ircombin-ation with an intake manifold heater and a control valve therefor', aA vacuum control fr'said valve" comprising movable means. havinga suction connection tor-the intake manifold land,lconnectedito. saidvalve toA operatey said valve, and means adapted to vary the responsiveness of said vacuum control. whereby the'. heating. effect. will v be variedrr 2. In combination with. an intake manifold heaterand acontrol valve therefor,- a. vacuum control `forzsaid valvecomprising acylinder having. a suction.v connection to the intake manifold,.a pistonv movable therein vand'connected to. saidyalve, a restricted air passage past said piston, an .air ventinto thecylinder, and means adaptedtovary the leffective.area

of said'air vent to vary.theresponsivenessof il the` heat control valve.v

3. Incombination .with an' yintake'.mam'iolfl heater and a control l,valve therefor, a .vacuum control .for said 'va-Ive comprising a .cylinder havinga suction connection to the -in-take tlf" manifold, .a .piston .movable therein and connected to; saidkvalve, ,afrestricted yair passage p ast `said piston, an airvent into. the. cylinder, anda manually.operableneedle valve4 adapted .to varyA the. effective .area .of said airI vent 15;;

to. vary the responsiveness ofthe hea-t control valve..

In testimony whereof I have hereunto subscribed myy name. atFlint,Genesee. County,

Michigan.

CHARLES H. vKIRBY..

4:0 on the dash 'tlbymearns of a Bowden wire 42. A. spring. pressed latchl is mounted in the rod guide 4A which is: clamped inthe. dash. The pull -rod 40 can be used to adjust the needle'valvebyv convenient steps, the latch dropping into one of theseveral grooves 45 in the rod.

It will thus be seen that" I have provided 

